We all have a fake
= Superpad III Android Tab 10.
I think that your wifi problem in the hardware problem, there is nothing you can do...
My wifi is working well, but not perfect (shorter range as my Nokia e71)... wifi reciever isnt very strong.
Capacity of battery: there is nothing you can do with software. That is "normal" = 2-3 hours when working.
GPS is working very well.
here are some other screenshots (nonenglish forum)